Recommendations on how to fix a sunshade on an outside wall without drilling

Question

I am looking for a good way to fix something light like a sunshade on the wall above my balcony without drilling into the wall (not allowed).

I was thinking about clamping something in between the ventilation gaps in the wall and connecting a little hook on it. But I cant find that much info about this solution.

I was wondering whether you guys have some feedback on this method, or if you guys can recommend any other solutions. The balcony isn't that big, so putting a parasol on the ground is something I'd rather not do.

Thanks a lot for your help! See pictures below for some context.

Ido